cross-origin-link-header-on-subresource.sub.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /preload/cross-origin-link-header-on-subresource.sub.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Link headers on a cross-origin subresource resolve relative URLs against the subresource's URL, not the document's</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/get-host-info.sub.js"></script>

<script src="/preload/resources/preload_helper.js"></script>

<body>

<script>

setup({single_test: true});

const remoteOrigin = get_host_info().HTTP_REMOTE_ORIGIN;

// The preloaded path, resolved against each candidate base.

const subresourcePreloadURL = remoteOrigin + "/preload/resources/dummy.css?cross-origin-link-header";

const documentPreloadURL = "/preload/resources/dummy.css?cross-origin-link-header";

// A cross-origin stylesheet whose Link response header preloads the path above.

const linkHeader = "<" + documentPreloadURL + ">; rel=preload; as=style";

const subresourceURL = remoteOrigin + "/preload/resources/echo-preload-header.py" +

    "?type=" + encodeURIComponent("text/css") +

    "&content=" + encodeURIComponent("/* dummy stylesheet carrying a preload Link header */") +

    "&link=" + encodeURIComponent(linkHeader);

let iterations = 0;

function check_finished() {

    if (numberOfResourceTimingEntries(subresourcePreloadURL) >= 1) {

        // Preload was resolved against the subresource's origin, as required.

        // Confirm it was NOT also issued (erroneously) to the document's origin.

        verifyNumberOfResourceTimingEntries(documentPreloadURL, 0);

        done();

        return;

    if (++iterations == 20) {

        // Surface the exact failure: with the bug the preload is issued against

        // the document's origin instead of the subresource's origin.

        verifyNumberOfResourceTimingEntries(documentPreloadURL, 0);

        verifyNumberOfResourceTimingEntries(subresourcePreloadURL, 1);

        done();

        return;

    step_timeout(check_finished, 250);

window.addEventListener("load", function() {

    verifyPreloadAndRTSupport();

    assert_not_equals(remoteOrigin, get_host_info().HTTP_ORIGIN,

        "test requires the subresource to be cross-origin to the document");

    const link = document.createElement("link");

    link.rel = "stylesheet";

    link.href = subresourceURL;

    document.head.appendChild(link);

    step_timeout(check_finished, 250);

});

</script>